Wooden trusses using metal plate connections and fabricated with Gmelina arborea , Tectona grandis and Cupressus lusitan
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ORIGINAL ARTICLE
Wooden trusses using metal plate connections and fabricated with Gmelina arborea, Tectona grandis and Cupressus lusitanica timber from forest plantations Monzerrath Rivera-Tenorio1
•
Roger Moya1
•
´ ngel Navarro-Mora2 A
Received: 29 July 2020 / Accepted: 5 November 2020 / Published online: 17 November 2020 Ó Indian Academy of Wood Science 2020
Abstract The present work aims at determining the behaviour relative to load applied and displacement and the design values of Howe trusses 7.2 m long fabricated with timber from Gmelina arborea, Tectona grandis and Cupressus lusitanica, using metal plates. The static flexural strength of the trusses was tested by applying the load to three different points, determining the load and the displacement at the central point of the truss, and then these values were used in the SAP2000 program, to define the design values. The results showed design loads at 5.00 kN, 6.34 kN and 5.52 kN and displacements at 1.53 cm, 1.27 cm and 1.71 cm, for trusses fabricated with G. arborea, T. grandis and C. lusitanica timber, respectively. As for the design tables, the values of maximum load diminished with increase in support spans (with 5 m, 6 m, 7 m and 8 m simulated support spans). The load ranged between 59.05 and 186.21 kg/m for G. arborea, 91.38 to 286.39 kg/m for T. grandis and 57.45 to 183.35 kg/m for C. lusitanica. Although truss manufacturing with the three species is viable, T. grandis showed the highest potential. Keywords Wood constructions Truss Joints Metal plates Design values & Roger Moya [email protected] Monzerrath Rivera-Tenorio [email protected] ´ ngel Navarro-Mora A [email protected] 1
Escuela de Ingenierı´a Forestal, Instituto Tecnolo´gico de Costa Rica, Apartado Postal 159-7050 Cartago, Costa Rica
2
Escuela de Ingenierı´a en Construccio´n, Instituto Tecnolo´gico de Costa Rica, Apartado Postal 159-7050 Cartago, Costa Rica
Introduction The mechanical characteristics of wood, its great environmental benefits and low transformation costs make of it a suitable material for engineering (Svajlenka et al. 2017). Wood has some advantages over other structural construction materials such as brick, metal, concrete and different types of plastics (Takano et al. 2015). Wood can be transported and transformed using reduced amounts of energy (Shanuka et al. 2018). However, wood’s relatively low load capacity compared to concrete and steel restricts its use in highly demanding structural applications (Kla¨usler et al. 2013). Thanks to current technological advancements, the wood offers technically improved products for certified constructions, added to all of its advantages that are presently recognized when compared to other construction materials (Takano et al. 2015). Among these advantages is brittle in some failure modes to its light weight, and its flexibility, making wood an optimum seismic-resistant material (Pan et al. 2018). As a natural raw material, it involves direct reduction of energy consumption and CO2 emissions (Svajlenka et al. 2017
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